1211131322121 has 16 divisors (see below), whose sum is σ = 1846504326528. Its totient is φ = 691710960000.

The previous prime is 1211131322119. The next prime is 1211131322153. The reversal of 1211131322121 is 1212231311121.

It is not a de Polignac number, because 1211131322121 - 2¹ = 1211131322119 is a prime.

It is a super-2 number, since 2×1211131322121² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1211131322101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15129180 + ... + 15209021.

It is an arithmetic number, because the mean of its divisors is an integer number (115406520408).

Almost surely, 2^{1211131322121} is an apocalyptic number.

It is an amenable number.

1211131322121 is a deficient number, since it is larger than the sum of its proper divisors (635373004407).

1211131322121 is a wasteful number, since it uses less digits than its factorization.

1211131322121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30340112.

The product of its digits is 144, while the sum is 21.

Adding to 1211131322121 its reverse (1212231311121), we get a palindrome (2423362633242).

The spelling of 1211131322121 in words is "one trillion, two hundred eleven billion, one hundred thirty-one million, three hundred twenty-two thousand, one hundred twenty-one".